Dependence of the superconducting transition temperature of the filled skutterudite compound PrPt4Ge12 on hydrostatic pressure

Foroozani, N.; Hamlin, J. J.; Schilling, J. S.; Baumbach, Ryan; Lum, I. K.; Shu, Lei; Huang, Kevin; Maple, M. B.

doi:10.1016/j.physc.2012.08.008

Cited by 2 publications

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“…2), indicating a correlation between disorder and the suppression of superconductivity for low x concentrations, consistent with the result in LaPt 4 Ge 12−x Sb x . The unit-cell volume of superconducting Pt-Ge based skutterudites seems to be uncorrelated or very weakly correlated to their superconducting states, because the changes of T c upon applied pressure are small or non-monotonic; T c is probably more dependent on the electronic structure [55,56]. Humer et al discussed the decrease of the DOS and γ values with Sb substitution, and its role in facilitating a rapid suppression of superconductivity [40]; a very similar decrease of γ values for samples in the range 0 ≤ x ≤ 3 is observed in this study .…”

Section: Discussionmentioning

confidence: 99%

Investigation of superconducting and normal-state properties of the filled-skutterudite systemPrPt4Ge12−xSbx

et al. 2016

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We report a study of the superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12−xSbx. Polycrystalline samples with Sb concentrations up to x = 5 were synthesized and investigated by means of x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. We observed a suppression of superconductivity with increasing Sb substitution up to x = 4, above which, no signature of superconductivity was observed down to 140 mK. The Sommerfeld coefficient, γ, of superconducting specimens decreases with increasing x up to x = 3, suggesting that superconductivity may depend on the density of electronic states in this system. The specific heat for x = 0.5 exhibits an exponential temperature dependence in the superconducting state, reminiscent of a nodeless superconducting energy gap. We observed evidence for a weak "rattling" mode associated with the Pr ions, characterized by an Einstein temperature ΘE ∼ 60 K for 0 ≤ x ≤ 5; however, the rattling mode may not play any role in suppressing superconductivity.

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Section: Discussionmentioning

confidence: 99%

Investigation of superconducting and normal-state properties of the filled-skutterudite systemPrPt4Ge12−xSbx

et al. 2016

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Pressure Tuning of Superconductivity of LaPt4Ge12 and PrPt4Ge12 Single Crystals

et al. 2022

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We carried out electrical resistivity and X-ray diffraction (XRD) studies on the filled skutterudite superconductors LaPt4Ge12 and PrPt4Ge12 under hydrostatic pressure. The superconducting transition temperature Tc is linearly suppressed upon increasing pressure, though the effect of pressure on Tc is rather weak. From the analysis of the XRD data, we obtain bulk moduli of B=106 GPa and B=83 GPa for LaPt4Ge12 and PrPt4Ge12, respectively. The knowledge of the bulk modulus allows us to compare the dependence of Tc on the unit-cell volume from our pressure study directly with that found in the substitution series La1−xPrxPt4Ge12. We find that application of hydrostatic pressure can be characterized mainly as a volume effect in LaPt4Ge12 and PrPt4Ge12, while substitution of Pr for La in La1−xPrxPt4Ge12 yields features going beyond a simple picture.

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Dependence of the superconducting transition temperature of the filled skutterudite compound PrPt4Ge12 on hydrostatic pressure

Cited by 2 publications

References 23 publications

Investigation of superconducting and normal-state properties of the filled-skutterudite systemPrPt4Ge12−xSbx

Investigation of superconducting and normal-state properties of the filled-skutterudite systemPrPt4Ge12−xSbx

Pressure Tuning of Superconductivity of LaPt4Ge12 and PrPt4Ge12 Single Crystals

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